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Detecting Current Errors Section 4-5

Installing Current

Transformers (CT)

(HB Alarm)

Connect the CT in advance to terminals A8 and A9 (CT1) or A7 and A9 (CT2),

and pass the heater power line through the CT's hole. Refer to Current Trans-

former on page 190 for details on compatible CT specifications, models, and

dimensions.

1. Single-phase Heaters

Install the CT as shown below.

2. Three-phase Heaters

Two CTs are required when using a three-phase power supply, regardless

of the type of wiring.

a. Delta Connection: Refer to the following diagram for CT installation po-

sitions.

Note Heater voltage fluctuations are not considered here, so take that

into account when setting the detection current.

b. Star Connection: Refer to the following diagram for CT installation po-

sitions.

Note Heater voltage fluctuations are not considered here, so take that

into account when setting the detection current.

c. V Connection: Refer to the following diagram for CT installation posi-

tions.

Note Heater voltage fluctuations are not considered here, so take that

into account when setting the detection current.

To CT in

AC line

Load Load: Heater (example)

To CT input

AC line

Load: Heater (example)

To CT input

AC line Load

Load

To CT input

Load: Heater (example)

To CT input

AC line

Load

Omron EJ1 User Manual

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